First, if the image recently posted turns out to be copyright, that and others by Victor Lumas can be found at
http://www.cyber-heritage.co.uk/history/victor.htmI don't know a lot about art, but would hazard a couple of observations:
Is the image you first posted a true representation of the colours of the original? Compared to the Lumas pictures there seems to be a narrower range of colours, though by tweaking the contrast and saturation on yours I can get something more similar.
Also, the brush strokes in yours, particularly in the sky and the building on the right, don't seem to match the Lumas works.
What might be helpful would be to contact the chap behind the site with the pictures to ask for his opinion. He is evidently a Lumas fan, maybe also an expert, and there appears to have been contact with some of his descendants.
